thompson



2 Sheets-Sheet 2.

(No Model.)

S. E. MOWER.

PROCESS OF TEMPERING.

No. 337,980. Patented Mar. 16, 1886.

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UNITED STATES PATENT Trice.

SAMUEL E. MOXVER, OF NENV HAVEN, ASSIGNOR TO HENRY G. THOMPSON,

OF MILFORD, AND HARRY G. THOMPSON, OF NENV HAVEN, CONNECTI- OUT, AND ARTHUR G. THOMPSON, OF NEWV YORK, N. Y.

PROCESS oF TEMPERING.

SPECIFICATION forming part of Letters Patent No. 337,980, dated March 16,1886.

(No specimens.)

To all whom) it may concern:

Be it known that I, SAMUEL E. MOWER, of New Haven, county of New Haven, and State of Connecticut, have invented an Improve ment in Processes of Tempering, of which the following description, in connection with the accompanying drawings,is aspecification, like letters on the drawings representing like parts. This invention has for its object to temper IO the toothed edge of a metal strip or band in the manufacture of saws, and I accomplish my object by means of an apparatus to be described, whereby the metal band is preferably first heated below the temperpoint, and then the toothed edge of the band so heated issubjected to a tempering heat and immediately cooled or tempered, all in continuous operation.

As heretofore practiced the metal strip or band has been brought to the required tempering-heat in one apparatus or furnace, and then transferred to another to be hardened or tempered.

In accordance with my invention the toothed metal strip or band to be tempered is herein shown as passed through a preliminary heater, represented as a jacket containing one or more burners fed by gas from a gas chamber supported by the frame of the apparatus. Ad jacent to the chamber or jacket containing the burners referred to is a standard provided with an upwardly-extended metal plate grooved at its edge to form a guide for the reception of the toothed metal strip or band to be tempered, 3 5 the depth of the groove in the said plate being a little less than the width of the toothed metal strip or band to be tempered, this being extended upward and above the grooved plate. That part of the said band reheated by the ac- 0 tion of the blow-pipes to be described is to be raised to tempering-heat. The jacket referred to as surrounding the said burners has its sides or walls slotted to permit the toothed metal strip or band to be fed through the said heater 5 in any convenient manner, the saidjacket or casing having adjustable guide-pieces secured near its slots to control the position of the metal band with relation to the groove referred to.

I have also in accordance with my invention placed upon the bed of the apparatus uprights made longitudinally adjustable thereon in slots of the said bed, each upright supporting at its top a blow-pipe provided with a cook, and being connected by suitable separate pipes or tubes to a separate gas and air reservoir or chamber. A stationary upright secured to the bed of the apparatus supports a water-supply ing pipe, also provided with a cock, the said pipe being connected to a reservoir containing water or other usual fluid, whereby the said fluid is permitted to fall upon the heated metal strip or band issuing from the slot in the guide remote from the preliminary heater.

Figure 1 is a front elevation of a tempering apparatus embodying my invention, the front of the frame being broken out to show the gas-reservoir; Fig. 2, a plan view of Fig. 1; Fig. 3, a section of Fig. 1 online 0000, and Fig. 4 a detail to be referred to.

The frame-work A A, of suitable shape to 7: sustain the different parts of the apparatus, has attached toit a base, a, provided with nipples, upon which are screwed two burners, a

a, located within the chamber of ajacket, a open at its lower end, as at 8, for the reception of atmospheric air, the said jacket and burners constituting a preliminary heater.

The base a of the burner is connected by pipe I) and projection I) with a gassupplying reser voir, b. The jacket a at each side, near its upper end, is slotted at opposite sides, as at a, for the passage of the steely metal or band 6, (shown by dotted lines, Fig. 3, and full lines, Fig. 4,) the lower edge of the said band resting upon blocks a, slotted and held in adj nsted position by screws a The frame-work supports a second chamber,

0, containing compressed air, and nipples or rigid pipes c therein have applied to them rubber pipes 0 which arejoined to one end of 0 a blow-pipe if, of usual construction, the said blow-pipe also having connected to it the pipe I), titted to the short pipe I), inserted in the gasreservoir b, the blow-pipe being thus pro vided with gas and air in usual manner.

Each blow-pipe (there being two herein 3 shown) is pivoted upon a post, d, made vertioally adjustable in a foot, D, adjustably mounted upon the bed-plate A. The bed-plate A, neXtthe preliminary heater, has an upright, d attached to it by screws d This upright carries a guide, 6, grooved at one edge for the reception of the band c after it emerges from the preliminary heater, the depth of the groove in the guide being such as to enable one edge only of the band to project above the guide, the said edge so projecting receiving against its opposite sides the blow-pipe frame, which latter raises the exposed edge of the band to tempering-heat, the band immediately thereafter receiving upon it water or other tempering-fluid from a small discharge-tube,f, of a cock, f, supplied with water by a pipe, f in communication with a water-supply pipe, preferably under a head or pressure.

The water discharged upon the heated metal band effects the hardening of that edge which was broughtto tempering-heat by the blowpipe, leaving the main part and its opposite edge soft or unhardened.

If desired, the preliminary heater may be dispensed with and the edge of the metal strip or band subjected to the action of the blowpipes without being first moderately heated; but in practice I prefer to employ the construction shown in the drawings, and so I jde sire it to be understood thatthe band might be raised to tempering heat by a single blow-pipe.

I do not herein claim the apparatus shown and described, the same forming the subjectmatter of certain claims in my application, Serial N 0. 184,308, filed November 30, 1885.

I claim The herein-described method of tempering the toothed edge of a metal strip or band in the manufacture of saws, which consists in protecting the back of the said strip or band to, at, or near the base of the teeth out therein, subjecting the toothed edgeonly to a tempering-heat opposite the point where the back is so protected, thereafter moving the said strip or band and cooling the toothed edge previous] y raised to temperingheat while another portion of the same strip or band is be ing raised, as described, to tempering-heat, the heating and cooling described being-practiced on the same edge of the same strip or band at the same timeor by acontinuous operation, all substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL E. MOWER.

\Vitnesses:

HENRY G. THOMPSON, J. 0. WIRSING. 

